Improvement in manufacture of bricks



UNITED STATES PATENT OFFICE.

NELSON PARMETER, OF GARDNER, MASSACHUSETTS.

Specification forming part of Letters Patent No. 24,050, dated May 17,1859.

To all whom it may concern:

Be it known that I, NELsoN PARMETER, of Gardner, county of Worcester,and Commonwealth of Massachusetts, have invented an 7 ImprovedFire-Proof Brick or Lining for Furnaces, Stoves, Buildings, and otherPurposes; and I do hereby declare that the following is a full and exactdescription of the mode of making the same, so as to enable othersskilled in the art to make and use it.

Sandstone, (found in the'vicinity of Potsdam, St. Lawrence county, NewYork,) pipeclay, and plaster-of-paris are each pulverized andsifted.Lime is slaked and also pulverized and sifted. These four materials,together with some salt, are then placed in a kettle over a fire, andwater is added to it. The mixture is to be constantly stirred and keptsufficiently warm, so as to be preserved in a state of consistencysimilar to common mortar for striking brick. This degree of consistencyis to be kept up by adding Water from time to time. As much of themixture as is wanted for immediate use is placed in a vat, and some ofthe coagulated blood is added to it to make it ready for use. Thematerial is then placed into molds of such form as will suit the purposethe bricks are intended for, and the bricks are to be struck before thematerial cools. The bricks must then be placed under cover and dried.Pains should be taken to turn them often, so as to prevent their Warping and cracking, preserve their symmetrical form, and dry them equally.The bricks,when nearly dried, are placed in the kiln and burned,commencing with a gradual fire, and care being taken not to heat themtoo quick, and keeping the fire as equal as possible.

Bricks intended for nice work-such as lining hot-air furnaces, stoves,and the likeought to be placed away from the ashes and near the middleof the stack, so as not to be exposed to the greatest heat, nor shouldthey be placed at the top of the stack, too far from the fire.

The blood used in the above operation is put up with some salt, so, asto keep in the proper state of preservation until using it.

The above-named component parts of my improved fire-proof brick orlining are used in the following proportions, according to weight:sandstone, one part; pipe-clay, one part; plaster-of-paris, one part;lime, foureighths part; salt, two-eighths part; coagulated part of theblood, (called crassamentum,) one-eighth part.

Having described my improved fire-proof brick or lining, what I claimtherein as new, and desire to secure by Letters Patent, is-

A fire-proof brick or lining composed of the above-named ingredients, inthe proportions set forth, and in the manner substantially as described.

TI-Ios. H. DODGE, M. O. GRITZNER.

